Time-element device.



G. B. SUHLT I.

TIME ELEMENT DEVICE.

APPLICATION FILED JULY 28, 1911.

1,027,440. Patented May 28. 1912.

BDUMOQM 1 v QwummXQm/ I cf cii gcougsc 9.5. fip xiag inverse, time element.

more]? sTA'rirs PATENT orriouii scones 13. courier, or MILW'AUKEE, WISCONSIH, ASSIGNOR 'ro ALLISQCHALMERS COMPANY, A GORIORATIOIJ or new rumor.

oomeo.

duplication filed July 28, 1911.

To all 11v; om trim-(1,3; concern.

se it known that I, Grocer: 13. Serum, 1i citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, hove invented certain new and useful Improvements in TimeElemeut Devices, of which the following is it full, clear, and exactspecification.

My invention relates to time element dcviccs. I

It is trequently desirable condition in a circuitto be protected the circuitbe broken utter a predetermined time after the rise of such condition, and that such predetermined time be inverse function of the extent of such abnormality.

It is the object ot my present, invention to provide a device obtaining; such on in carrying out my invent-ion there is pro titled a metal dis-l: mounted for rotation between the poles of omagnet the flux of which on inverse function of the abnormality of the condition in the circuit to be protected. 'llie usual abnormal condition to be e ted against is an o'rcrloetL in which to flux. of such nmgfi'ietvaried in lltz't i use to the cum in the ircuit to lie lfi'tltt d. disk is mechanically mnneetctl in, any suitablomeuner to the dc tit-e tbt nim'einentof which it is desired to retard.

The itll'lOltS novel features of my invention appear from the description and nd will be particularly pointed iagrmntneticelly a systen on invention; Fig. '2 is a plan new ot' the inverse time element derice; and, F F shows diagrammatically it modification.

The device to be protected is shown-as a generator 10, which is connected. to a circuit 11 through a circuiobreoker 12. This circuit-breaker is biased to open position, butin the arrangement shown is normally shows l held in closed position by a latch 13' controlled by av holding coil 1+1. The coil 14: is connected as e nc voltoge coil. In the circuit oftlie coil. 14: is it switch 15, which may be opened by lifl-Iltl or automatically. The automatic opening of the switch occurs Whenever, because oil a predetermined overload on the generator 10, the overload coil Specification of Letters Fatent.

that upon the occurrence of an overload or other sonormol ever, by the rotation of the disk 21 E i iterated May 28,1919.

Serial no. c imes.

24 on e downward projection of the core 6 l9. Tile-ratchet 22 is so arranged that when the core 19 is raised the disk 21 is rotated thereby, but when the core 1.9 drops the disk is not rotated. The disk 21 projects between the poles of 2., magnet 25, Whichio duces oddy-currents in such disk when the latter is rotated and thereby tends to prevent such rotation. The flux produced by the magnet 25 is an inverse function of the current supplied to the generator 10. This relationship between the flux ot the magnet 25 and the current supplied to the generator 10 nay be obtained in different ways, two of which are illustrated in Figs? 1 and 3 respectiv'ely.

In the arrangementshown in Fig: l, the

moguet'25 has an energizing coil 26 which illustrated by connecting it in shunt to z. 95

variable resistance :28 in the circuit supplied by such generator. I

Upon the occurrence of on overload, the solenoid 16 closes the switch 17 to cause the energization of the solenoid l8, and the letter begins to raise the core 19. The upward movement of the core 19 is retarded, hogs etzween the poles of the magnet. 25, the amount of the retardation depending upon the value of the flux ofsuch magnet. Since the demagnetization produced by the coil 27 is a. direct imitation of the current supplied by the generator 10, such flux, and therefore such retardation, is an inverse function of such current. In consequence, the time re quired for the coil 18 to lift its core 19 sufliciently for the projection 20 to open the switch-15 is an inverse function of the overload on the generator 10. Upon such opening of the switch 15, the coil it releases the latch 13 and the circuit-breaker 1.2 opens automatically. The teeth on the rack 2 1 are preferably cut away at the lower part of such rack, so that the last part of the upward movement of the core 19 may be rapid and the projection 20 may open the switch 15 quickly. I

In the arrangement shown in Fig. 3, the magnet 25 has but one coil, an energizing coil 29. In the circuit of this coil 29 is a variable resistance 30, the controlling arm 31 of which is operated by a coil 32 connected to carry current pro ortional to that supplied to thegenerator 0. This resistance 30 is normally all cut out, as illustrated. \Vhen the current supplied to the generator 10 reaches a predetermined value, the solenoid 16 closes the switch 17 to ener gize the solenoid l8 and the latter begins to raise its core 19 as in the arrangement shown Here also the upward movement in Fig. 7. of the core 19 is retarded by the rotation of the disk 21 between the poles of the magnet 25. If the current supplied to the generator 1O rises beyond the value necessary for the closing of the switch 17 the solenoid 32 raises the arm 31 to out part or all of the resistance 30 into the circuit of the coil-29.

The amount of resistance thus cut in the circuit of the coil'29 is a direct function of the current supplied by the generator 10. The cutting in of the resistance 30 weakens the magnet 25 and decreases the retarding effect on the upward movement of the core 19 so that here also the time required after the i=losing of the switch 17 for the opening of the switch 15 and the consequent tripping of the circuit-breaker 12 is an inverse function of the overload on the generator 10.

Many modifications may be made in the arrangements shown and described, and I aimto c'over all such modifications which do not involve a departure from the spirit and scope of my invention as set forth in the following claims.

WhatlI claim as new is:

1. lnjcombination, a device to be protected, means for protecting such device upon the occurrence of an abnormal condition, and a time element device for retarding-the operation of said protective device, said time element device comprising a metal member, a magnet for producing eddy currents in such member upon relative rotation between the member and magnet, and means for causing the flux. of such magnet to be an inverse function of the extent of such abnormal condition.

2. In combination, a circuit to be protected, a circuit-breaker in such circuit, and a time element device controlling the operation of such circuit-breaker, said time element device comprising a metal member, magnet between the poles of which such member rotates, and means for causing the flux produced by such magnet to vary in inverse sense to the current in such circuit.

3. In combination, an electric circuit, and a'time element device controlling such-circuit, said time element device comprising a metal disk, a magnet which induces eddy currents in said disk upon the rotation of the latter, and means for causing the flux produced by such magnet to be an inverse function of the current in such circuit.

4. In combination, an electric circuit, and a, time element device controlling such circuit, said time-element device comprising a rotatable metal disk, and an electromagnet the flux of which is an inverse function of the current in such circuit and induces eddy currents in said disk upon the rotation thereof. s

5. In combination, an electric circuit, and a time element device controlling said circuit, said time element device comprising a rotatable metal disk, a magnet which induces eddy currents in said disk upon the rotation thereof, and a coil which carries current proportional to that in said circuit and tends to cause the deenergization of such magnet.

Milwaukee, Wis, July 22, 1911.

In testimony whereof I affix my signature, in the presence of two witnesses.

GEORGE B. SCHLEY.

Witnesses 

